feat(dashboard): React frontend scaffold with overview page

- Vite + React 18 + TypeScript + Tailwind CSS
- Dashboard overview with health gauge, pillar bars, alerts
- WebSocket hook for real-time updates
- Layout with sidebar navigation and live indicator
- Placeholder pages for Mesh, Environment, Config, Alerts
- Dark theme ops center aesthetic with JetBrains Mono

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dashboard-frontend/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "meshai-dashboard",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "^18.3.0",
+    "react-dom": "^18.3.0",
+    "react-router-dom": "^6.23.0",
+    "recharts": "^2.12.0",
+    "lucide-react": "^0.383.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.3.0",
+    "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.0",
+    "typescript": "^5.4.0",
+    "vite": "^5.4.0",
+    "tailwindcss": "^3.4.0",
+    "postcss": "^8.4.0",
+    "autoprefixer": "^10.4.0"
+  }
+}